NYC 9/11 Public Portal Document
Hillmann Environmental Group, LLC
• Levels of combustible gasses (LEL) should remain below 1% and never exceed 10% in an occupied
space. Levels of combustible gasses in the subject space remained below the limit of detection of 1%.
• Levels of airborne asbestos fibers ranged from below the limit of quantification of 0.004
fibers/cc to 0.005 fibers/cc, and were well below the EPA National Emission Standard for
Hazardous Air Pollutants (NESHAP) standard of 0.01 fibers/cc. Dust samples were also taken
in the subject space and analyzed for asbestos structures. After cleaning the facility of debris
from the World Trade Center collapse, no asbestos fibers were detected in the samples.
Bulk samples of dust and debris were collected and analyzed for asbestos content. No
asbestos was identified in the collected samples.
1.3 Recommendations
Based on these results, Hillmann finds no characteristics of the Indoor Air Quality that require immediate
remediation. Elevated temperatures and relative humidities do have the potential to cause occupant
discomfort. However, these elevated readings occurred when ventilation systems were not fully
functioning due to outside odors. If tenant complaints occur, it is recommended that thermostats be
adjusted to remain within recommended levels.
Cushman & Wakefield!44 Wall Street, New York, NY/Project Number N3-7476 Page 2
NYC-WTC 000094934
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